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Gilsang Jeong,Jonggill Kim,Wontae Kim,Youngchul Choi,Kwanho Park,Jiyoung Choi 한국응용곤충학회 2009 한국응용곤충학회 학술대회논문집 Vol.2009 No.05
Microsporidia are obligate fungal intracellular parasites of all animal taxa. Among them the genus Nosema (Nosematidae) is known as the most common entomopathogen. Of these parasites, the ribosomal organization is one of the most pronounced molecular characteristics. One type is the normalarrangement of small subunit (SSU)-internal transcribed spacer (ITS)-large subunit (LSU) in the DNA sequence order. The other is the reverse arrangement of LSU-ITS-SSU. The latter is assigned to be the ‘true’ Nosema in the Nosema/Vairimorpha clade. However, we found that the SSU sequence of a strain of Nosema species having the normal arrangement of its rRNA sequence seemed to be more closely related to the ‘true’ Nosemagroup. Consequently we have further analyzed the complete sequence of rRNA. The results imply that there might be arecombination event in its rRNA evolution and/or the strain may form a novel group near the ‘true’ Nosema group. Interestingly both SSU and LSU of the ‘true’ Nosema and others may be under different selection pressure. We have also found that the size of ITS is distinct between the ‘true’ Nosema and other microsporidian species within the Nosema/Vairimorpha clade. This feature should be a useful diagnostic tool to distinguish the ‘true’ Nosema from others in the clade.
Chimerical nature of the ribosomal RNA gene of a Nosema species
Gilsang Jeong,Yonggu Lee,Jonggill Kim,Wontae Kim,Kwanho Park,Youngcheol Choi,Kyoung Sang Cho,Sungwoo Bae,Jiyoung Choi 한국응용곤충학회 2010 한국응용곤충학회 학술대회논문집 Vol.2010 No.05
Taxonomic resolution of the Nosema/Vairimorpah clade has been augmented with DNA sequences of the small subunit (SSU) and large subunit (LSU) ribosomal RNA (rRNA) and the arrangement of SSU and LSU. Based on the two characteristics, the clade is largely divided into two, i.e. 'true' Nosema sub-group and 'non-true' Nosema sub-group within the clade. Our study shows that a novel Nosema species isolated from Pieris rapae has mixed characteristics of the 'true' and non 'true' Nosema sub-group based on the topology of SSU and LSU sequences, and rRNA of the isolate is normally organized. Additionally, the length of ITS can be a diagnostic tool to distinguish 'true' Nosema from non 'true' Nosema in the Nosema/Vairimorpha clade based on its nucleotide length as reported before. To our knowledge, this is the first report of recombination event in the Nosema/Vairimorpha clade.
‘영드’에 관한 대중의 인식 및 자기 주도적 영어학습 행태: 소셜 빅데이터 분석을 활용하여
권은영 ( Kwon Eun-young ),이종길 ( Lee Jonggill ) 한국중등영어교육학회 2021 중등영어교육 Vol.14 No.3
This study aims to explore the Korean public’s perceptions of British TV dramas and their self-motivated English learning patterns using social big data analysis. For this purpose, texts containing the phrase ‘British TV drama’ from Twitter and YouTube were extracted and analyzed employing network, frequency, and semantic analyses. The results showed that (1) whereas the public shared information about British TV dramas on Twitter, their opinions and ideas about learning English using British TV dramas were primarily discussed on YouTube; (2) the public seemed to be most interested in improving their British English pronunciation when studying English with British TV dramas; and (3) the public seemed to utilize YouTube as a tool for self-motivated English learning as well as a place for sharing fandom culture. Pedagogical implications are provided.
Wolbachia infection in the Korean endemic firefly, Luciola unmunsana (Coleoptera: Lampyridae)
Gilsang Jeong,강태화,Haechul Park,,Wontae Kim,Youngcheol Choi,Kyeongyong Lee,Ingyun Park,Hasik Sim,Jonggill Kim 한국응용곤충학회 2009 Journal of Asia-Pacific Entomology Vol.12 No.1
Wolbachia is one of the most prevalent endosymbiontic bacteria of arthropods. The bacterium induces sex ratio distortions in various host insects through processes such as cytoplasmic incompatibility, feminization, male killing, and parthenogenesis. We investigated if the Korean endemic firefly, Luciola unmunsana was infected with the bacterium because the species had an abnormal sex ratio in the field. The results show that some individuals are infected with the bacterium. Phylogenetic analyses showed that the bacterial strain infecting the firefly is closely related to strains that infect phylogenetically distant hosts.
Incidence of Wolbachia and Cardinium Endosymbionts in the Osmia Community in Korea
Gilsang Jeong,Kyeongyong Lee,최지영,Seokjo Hwang,박병도,Wontae Kim,최영철,Ingyun Park,Jonggill Kim 한국미생물학회 2009 The journal of microbiology Vol.47 No.1
Sex ratio distorting endosymbionts induce reproductive anomalies in their arthropod hosts. They have recently been paid much attention as firstly texts of evolution of host-symbiont relationships and secondly potential biological control agents to control arthropod pests. Among such organisms, Wolbachia and Cardinium bacteria are well characterized. This study aims at probing such bacteria in the Osmia community to evaluate their potential utilization to control arthropod pests. Among 17 PCR tested species, Osmia cornifrons and a parasitic fly are infected with Wolbachia and a mite species is infected with Cardinium. Phylogenetic tree analyses suggest that horizontal transfer of the bacteria occurred between phylogenetically distant hosts.
Family-wide distribution and recombination of the Wolbachia endosymbiont in Coleopteran insects
Gilsang Jeong,Taehwa Kang,Soojin Hwang,Haechul Park,Youngcheol Choi,Kyoungsang Cho,Wantae Kim,Kwanho Park,Jonggill Kim,Youngbo Lee,Taeman Han,Jiyoung Choi 한국응용곤충학회 2009 한국응용곤충학회 학술대회논문집 Vol.2009 No.10
The Wolbachia bacterium, one of the most prevalent endosymbiotic bacteria, is known to induce reproductive anomalies such as cytoplasmic incompatibility, feminization, male killing and parthenogenesis in various arthropod species. The bacterium is considered to have had huge impacts on hosts' reproductive biology, immunity, evolution, and molecular machineries. Infection surveys on the bacterium have rather been limited to specific taxa that are mainly of economical importance or conducted with randomly collected organisms. Here we investigated infection frequency of Wolbachia in 206 Coleopteran insects collected from Korea. Among them 28 species (13.59%) across families proved to harbor Wolbachia. The phylogenetic trees based on the partial 16s rRNA gene and the partial Wolbachia surface protein (wsp) gene of Wolbachia show that all the Wolbachia strains belong to either Supergroup A or B and Wolbachia evolved independently from its hosts. In addition, the cophylogenetic analysis of the 16s rRNA gene and wsp gene implies that there have been horizontal DNA transfers and recombination events within and between divergent Wolbachia supergroups.
Molecular identification of two Trichogramma species (Hymenoptera: Trichogrammatidae) in Korea
Gilsang Jeong,최지영,Hwangyong Kim,Youngcheol Choi,Wontae Kim,Kwanho Park,Sungwoo Bae,Jonggill Kim 한국응용곤충학회 2010 Journal of Asia-Pacific Entomology Vol.13 No.1
Trichogramma wasps parasitize eggs of various insect species. Several Trichogramma species have been commercialized to manage Lepidopteran agricultural pests. Correct species identification is essential for successful biological control. However, the microscopic size and morphological similarity of Trichogramma species makes correct identification very difficult. Internal transcribed spacer (ITS)-2 gene sequences have been used to identify Trichogramma species. Using this molecular marker, Trichogramma species that are commercially available in Korea were identified as Trichogramma ostriniae and Trichogramma brassicae. The latter has not previously been reported in Korea. Additionally, Cadra cautella and Sitotroga cereallela eggs (host eggs of the commercialized Trichogramma species in Korea) were infected with Wolbachia. However,Trichogramma were not infected with the bacterium. This indicates that horizontal transfer of Wolbachia does not occur from host to wasp.